"On days like this there are no Republicans or Democrats; we are Americans united in concern for our fellow citizens," Obama stressed.

And along the same patriotic message, Steve Martin chose to quote a verse from "The Star-Spangled Banner" — an effective reminder of America's long history of overcoming even the worst of tragedies.

'…And the rockets red glare, the bombs bursting in air, gave proof through the night, that our flag was still there,'" Martin wrote. "‪#Boston‬."

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